1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1338830075c2ff6a55e7ed9fc6976b076b98df6483525ff6b93a0552c706d2b. Chain 2 (Bitcoin): anchored in block 954047 (2026-06-17T04:56:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/42051b82-24b5-4c49-b43b-01c219a9e6d6.json and https://artists.proofprofile.net/proofs/artist/42051b82-24b5-4c49-b43b-01c219a9e6d6.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Missa brevis in G Minor, BWV 235: I. Kyrie
Bach: Missæ Breves, BWV 232-236 (Complete Recordings)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b21c41ab55bbdc6fcf77a4cb8531e7c05c22fc3a4ab50e82d281d9fef39b19. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713002 — a six-check JSON result.
Missa brevis in G Minor, BWV 235: II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4839060c9e6c693f8f863763c0ee238e0e893350485ff87c633fbbd5ed0a2b1b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713003 — a six-check JSON result.
Missa brevis in G Minor, BWV 235: III. Gratias
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e70cc0f6d2ec9103b7c093e9786bd68b96ac7bc11c44d2db5b0e7f039c1e12a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713004 — a six-check JSON result.
Missa brevis in G Minor, BWV 235: IV. Domine fili
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70708fdda56e0f0ee7678264f294bb429c4ade82ce18952730118fa2cafcb86. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713005 — a six-check JSON result.
Missa brevis in G Minor, BWV 235: V. Qui tollis peccata mundi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6b64dc5a7a98b78bca60fff9b1e2d44bea8a5bf7f84774e604b955fa74f9b5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713006 — a six-check JSON result.
Missa brevis in G Minor, BWV 235: VI. Cum sancto spiritu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf456df00fbf106c8611625643935e6cac42866806406a835c7343b6e50160f94. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713007 — a six-check JSON result.
L'incoronazione di Poppea, SV 308, Act I Scene 4: Speranza, tu mi vai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350627ab21ba42ac2f411e940b7c0fe25acb7ede8e8c913b7a0b6341fc81a301. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1624901 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102d4422709f64f9515fbdd70a31875a31f27f82b9eae91b304bd883d79ea675. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713001 — a six-check JSON result.
Missa brevis in A Major, BWV 234: I. Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bedaecd54e929ecc30a819d9a571b4be049854d486dcb9123679e3c51fa45a3. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713008 — a six-check JSON result.
Missa brevis in A Major, BWV 234: II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49fe1cafd82854e7c9aa4d4bad0d3c3b06405f4e870ed9c90d678c2790b8079. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713009 — a six-check JSON result.
Missa brevis in A Major, BWV 234: III. Domine Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc052c2d19fc8dccc4574d0678709e672add01120fdfb0bfbffe44661b8821514. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713010 — a six-check JSON result.
Missa brevis in A Major, BWV 234: IV. Qui tollis peccata mundi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28a64a8f4ba68742b80b95d8559af00a70939c635700ea2cb2a5fe23ef3c831. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713011 — a six-check JSON result.
Missa brevis in A Major, BWV 234: V. Quoniam tu solus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c229d135d556f2217562a0c34dbb337c161efb356ff578fe8c23246bdeb527. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713012 — a six-check JSON result.
Missa brevis in A Major, BWV 234: VI. Cum sancto spiritu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748d0bd869b9ccf717f1f6e7fba255272b27a6da1120ca4cd5c67fd5fc16b826. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X0713013 — a six-check JSON result.